QT, Google AdWords API & gsoap

I'm dealing with this situation for days but have no clue ! Please Help !!!

I need to communicate with Google AdWords API from QT Quick Application.
What I'm already done so far is get Access Token from Authentication Page.
I can make a request use QNetworkRequest and Service return the result.

What I want to do is using gSoap generated code to send the same request.
But it return error code 30 : SOAP_SSL_ERROR